Cabinet lock key with audio indicators

ABSTRACT

An electronic key for a merchandise security device is provided. The electronic key may include electronic circuitry for providing electrical power to a lock mechanism for locking and unlocking the lock mechanism. The electronic key may also include an audio component configured to indicate a status of the lock mechanism.

CROSS REFERENCE TO RELATED APPLICATIONS

This application is a continuation of U.S. application Ser. No.13/897,790 filed on May 20, 2013, which claims the benefit of U.S.Provisional Application No. 61/649,539 filed on May 21, 2012, each ofwhich is hereby incorporated by reference in its entirely.

FIELD OF THE INVENTION

Embodiments of the present invention relate generally to merchandisedisplay security systems and methods for protecting an item ofmerchandise from theft. More particularly, embodiments of the presentinvention relate to an electronic key for a merchandise security device.

BACKGROUND OF THE INVENTION

It is common practice for retailers to store and/or display relativelyexpensive items of merchandise on or within a merchandise securitydevice, such as a security display (e.g. alarming stand), securityfixture (e.g. locking hook, shelf, cabinet, etc.) or security packaging(e.g. merchandise keeper). Regardless, the security device stores and/ordisplays an item of merchandise so that a potential purchaser may view,and in some instances, interact with the item before making a decisionwhether to purchase the item. At the same time, the item is secured onor within the merchandise security device so as to prevent, or at leastdeter, theft of the item. The value of the item, however, may make it anattractive target for a shoplifter despite the presence of a merchandisesecurity device. A determined shoplifter may attempt to detach the itemfrom the security display or to remove the item from the securityfixture or from within the security packaging. Alternatively, theshoplifter may attempt to remove the all or a portion of the securitydevice from the display area along with the item.

In the case of a secure display or fixture, the security device isoftentimes firmly attached to a support, such as a pegboard, wire grid,horizontal bar rack, slatwall (also known as slatboard), wall, table,desk, countertop or like structure. In some instances, the securitydevice is secured to the support using a mechanical lock mechanismoperated by a non-programmable key, for example a conventional tumblerlock or a magnetic lock. In other instances, the security device issecured to the support using an electronic lock mechanism operated by aprogrammable key or remote.

There are known locking systems that utilize a key to transfer powerfrom the key to a lock or locking device using inductive power transfertechnology. Some cabinet locks include a visual indicator on the cabinetlock to indicate the status of the lock. However, there is no knownpower transfer key that includes an audio indicator for indicating thestatus of the lock or locking device operated by the key.

Accordingly, there exists a need for an improved programmable key foroperating a merchandise security device. There also exists a need for aprogrammable key that is configured to provide an audio indicatorindicative of the status of a lock mechanism.

BRIEF SUMMARY OF THE INVENTION

According to embodiments of the present invention, an electronic key fora merchandise security device is provided. The electronic key includeselectronic circuitry for providing electrical power to a lock mechanismfor locking and unlocking the lock mechanism. The electronic key furtherincludes an audio component configured to indicate a status of the lockmechanism. For example, the audio component may be configured to emit anaudible signal in response to the lock mechanism being locked orunlocked. In some embodiments, the audio component is configured to emita first audible signal and a second audible signal that is differentthan the first audible signal. The audible signal may be continuous orintermittent.

According to another embodiment, a method for protecting an item ofmerchandise from theft is provided. The method includes transferringelectrical power from an electronic key to a lock to thereby lock orunlock the lock and emitting an audible signal with the electronic keyin response to a change in state of the lock.

BRIEF DESCRIPTION OF THE DRAWINGS

The detailed description of the invention provided below may be betterunderstood with reference to the accompanying drawing figures, whichdepict one or more exemplary embodiments of an electronic key for usewith a merchandise security device in a merchandise display securitysystem and method according to the invention.

FIG. 1A shows an exemplary embodiment of a merchandise display securitysystem and method including a programmable electronic key, a merchandisesecurity device, a programming station and a charging station accordingto the invention.

FIG. 1B is an enlarged view showing the programmable electronic key ofFIG. 1A positioned on the programming station of FIG. 1A to beprogrammed with a security code.

FIG. 2 further shows the system and method of FIG. 1A with theprogrammable electronic key positioned to operate the merchandisesecurity device.

FIG. 3A further shows the system and method of FIG. 1A with theprogrammable electronic key disposed on the charging station.

FIG. 3B is an enlarged view showing the programmable electronic key ofFIG. 1A positioned on the charging station of FIG. 1A to recharge apower source disposed within the key.

FIG. 4 is an enlarged view showing the merchandise security device ofthe system and method of FIG. 1A.

FIG. 5 is an enlarged view showing the programmable electronic key ofthe system and method of FIG. 1A in greater detail.

FIG. 6 is an exploded view of the programmable electronic key of FIG. 5.

FIG. 7A is a perspective view of the programmable electronic key of FIG.5.

FIG. 7B is an end view of the programmable electronic key of FIG. 5.

FIG. 8 is a perspective view showing a lengthwise cross-section of theprogrammable electronic key of FIG. 5.

FIG. 9A is a top view showing the charging station of the system andmethod of FIG. 1A.

FIG. 9B is a perspective view showing a diagonal cross-section of thecharging station of FIG. 9A taken along the line 9B-9B.

FIG. 10 shows another embodiment of a merchandise display securitysystem and method including a programmable electronic key, a merchandisesecurity device, a programming station and a charging station accordingto the invention.

FIG. 11 is an enlarged view showing the programmable electronic key ofFIG. 10 positioned on the charging station of FIG. 10 to recharge apower source disposed within the key.

FIG. 12 is an enlarged view showing the merchandise security device ofthe system and method of FIG. 10.

FIG. 13 is an enlarged view showing the programmable electronic key ofthe system and method of FIG. 10 in greater detail.

FIG. 14 is a perspective view showing a pair of matched coils for usewith the programmable electronic key and the merchandise security deviceof FIG. 10.

FIG. 15A is a perspective view of the programmable electronic key ofFIG. 13.

FIG. 15B is an end view of the programmable electronic key of FIG. 13.

FIG. 16 is a perspective view showing a lengthwise cross-section of theprogrammable electronic key of FIG. 13.

FIG. 17A is a top view showing the charging station of the system andmethod of FIG. 10.

FIG. 17B is a perspective view showing a diagonal cross-section of thecharging station of FIG. 17A taken along the line 17B-17B.

FIG. 18 is a top view of another embodiment of an electronic key.

FIGS. 19 and 20 are state diagrams depicting “Desired Lock” and “DesiredRelock” experiences according to embodiments of the present invention.

FIGS. 21 and 22 are state diagrams depicting “Undesired Unlock” and“Undesired Relock” experiences according to embodiments of the presentinvention.

DETAILED DESCRIPTION OF EMBODIMENTS OF THE INVENTION

As explained in greater detail below, embodiments of the presentinvention are directed to an electronic key for a cabinet lock includingone or more audio indicators for indicating the status of the cabinetlock. In one embodiment, the electronic key includes electroniccircuitry and an audio component (e.g., a piezo or piezoelectric alarm)that provides a first audio indication indicating to a user the cabinetlock is in an unlocked (unsecured) condition. In another embodiment, thekey includes electronic circuitry and an audio component that provides asecond audio indication different from the first audio indicationindicating to a user the status of the cabinet lock was not successfullychanged, and more particularly, the status of the cabinet lock was notchanged from a locked stated to an unlocked state or from an unlockedstate to a locked state.

In some embodiments, the electronic lock and the electronic key aresimilar to those disclosed in U.S. Patent Publ. No. 2013/0081434,entitled Cabinet Lock for Use with Programmable Electronic Key and filedSep. 28, 2012, U.S. Patent Publ. No. 2012/0047972, entitled ElectronicKey for Merchandise Security Device and filed Aug. 31, 2011, and U.S.Patent Publ. No. 2011/0254661, entitled Programmable Security System andMethod for Protecting Merchandise and filed Jun. 27, 2011. In otherembodiments, the electronic lock and the electronic key are similar tothose manufactured by InVue Security Products Inc., including thePlunger Locks, Smart Locks, and IR2 and IR2-S Keys.

Referring now to the accompanying drawing figures wherein like referencenumerals denote like elements throughout the various views, one or moreexemplary embodiments of a merchandise display security system andmethod are shown. In the exemplary embodiments shown and describedherein, the system and method include a programmable electronic key,indicated generally at 20, 120, 200 and a merchandise security device,indicated generally at 40, 140. Merchandise security devices 40, 140suitable for use with the programmable electronic keys 20, 120, 200include, but are not limited to, a security display (e.g. alarmingstand), security fixture (e.g. locking hook, shelf, cabinet, etc.) orsecurity packaging (e.g. merchandise keeper) for an item of merchandise.However, a programmable electronic key (also referred to herein as amerchandise security key) according to the invention is useable with anysecurity device or locking device that utilizes power transferred fromthe key to operate a mechanical lock mechanism and/or utilizes datatransferred from the key to authorize the operation of an electroniclock mechanism, such as an alarm circuit. In other words, a programmableelectronic key according to the invention is useable with any securitydevice or locking device that requires power transferred from the key tothe device and/or data transferred from the key to the device. Furtherexamples of security devices and locking devices include, but are notlimited to, a door lock, a drawer lock or a shelf lock, as well as anydevice that prevents an unauthorized person from accessing, removing ordetaching an item from a secure location or position. It should be notedthat although the invention is described with respect to embodimentsincluding a programmable electronic key for transferring data andelectrical power to a merchandise security device to operate amechanical lock mechanism, the invention is equally applicable to anelectronic key for transferring only electrical power to a merchandisesecurity device to operate any component of the merchandise securitydevice, whether or not the device includes an internal or external powersource for operating another component of the device.

One embodiment of a merchandise display system and method according tothe invention is illustrated in FIGS. 1A-9B. The embodiment of themerchandise display security system and method depicted comprises aprogrammable electronic key 20, which is also referred to herein as amerchandise security key, and a merchandise security device 40 that isconfigured to be operated by the key. The system and method may furthercomprise an optional programming station, indicated generally at 60,that is operable for programming the key 20 with a security code, whichis also referred to herein as a Security Disarm Code (SDC). In additionto programming station 60, the system and method may further comprise anoptional charging station, indicated generally at 80, that is operablefor initially charging and/or subsequently recharging a power sourcedisposed within the key 20. For example, merchandise security key 20 andmerchandise security device 40 may each be programmed with the same SDCinto a respective permanent memory. The merchandise security key 20 maybe provisioned with a single-use (i.e. non-rechargeable) power source,such as a conventional or extended-life battery, or alternatively, thekey may be provisioned with a multiple-use (i.e. rechargeable) powersource, such as a conventional capacitor or rechargeable battery. Ineither instance, the power source may be permanent, semi-permanent (i.e.replaceable), or rechargeable, as desired. In the latter instance,charging station 80 is provided to initially charge and/or tosubsequently recharge the power source provided within the merchandisesecurity key 20. Furthermore, key 20 and/or merchandise security device40 may be provided with only a transient memory, such that the SDC mustbe programmed (or reprogrammed) at predetermined time intervals. In thisinstance, programming station 60 is provided to initially program and/orto subsequently reprogram the SDC into the key 20. As will be described,key 20 is operable to initially program and/or to subsequently reprogramthe merchandise security device 40 with the SDC. Key 20 is then furtheroperable to operate the merchandise security device 40 by transferringpower and/or data to the device, as will be described.

In the embodiment of the system and method illustrated in FIGS. 1A-9B,programmable electronic key 20 is configured to be programmed with aunique SDC by the programming station 60. A programming station 60suitable for use with the present invention is shown and described indetail in U.S. Pat. No. 7,737,844 entitled PROGRAMMING STATION FOR ASECURITY SYSTEM FOR PROTECTING MERCHANDISE, the disclosure of which isincorporated herein by reference in its entirety. As illustrated in FIG.1A and best shown in enlarged FIG. 1B, the key 20 is presented to theprogramming station 60 and communication therebetween is initiated, forexample by pressing a control button 22 provided on the exterior of thekey. Communication between the programming station 60 and the key may beaccomplished directly, for example by one or more electrical contacts,or indirectly, for example by wireless communication. Any form ofwireless communication capable of transferring data between theprogramming station 60 and key 20 is also possible, including withoutlimitation optical transmission, acoustic transmission or magneticinduction. In the embodiments shown and described herein, communicationbetween programming station 60 and key 20 is accomplished by wirelessoptical transmission, and more particularly, by cooperating infrared(IR) transceivers provided in the programming station and the key. Inone embodiment, the programming station comprises at least a logiccontrol circuit for generating or being provided with a SDC, a memoryfor storing the SDC, and a communications system suitable forinteracting with the programmable electronic key 20 in the mannerdescribed herein to program the key with the SDC.

As shown in FIG. 1B, programming station 60 comprises a housing 61configured to contain the logic control circuit that generates the SDC,the memory that stores the SDC, and a communications system, namely anoptical transceiver, for wirelessly communicating the SDC to acooperating optical transceiver disposed within the key 20. In use, thelogic control circuit generates the SDC, which may be a predetermined(i.e. “factory preset”) security code, or which may be a security codethat is randomly generated by the logic control circuit of theprogramming station 60 at the time a first key 20 is presented to thestation for programming. In the latter instance, the logic controlcircuit further comprises a random number generator for producing theunique SDC. A series of visual indicators, for example light-emittingdiodes (LEDs) 67 may be provided on the exterior of the housing 61 forindicating the operating status of the programming station. As shownherein, the programming station 60 may be operatively connected to anexternal power source by a power cord 70 having at least one conductor.Alternatively, the programming station 60 may comprise an internal powersource, for example an extended-life replaceable battery or arechargeable battery, for providing power to the logic control circuitand the LEDs 67.

In a particular embodiment, the logic control circuit of the programmingstation 60 performs an electronic exchange of data with a logic controlcircuit of the key 20, commonly referred to as a “handshakecommunication protocol.” The handshake communication protocol determineswhether the key is an authorized key that has not been programmedpreviously (i.e. a “new” key), or is an authorized key that is beingpresented to the programming station a subsequent time to refresh theSDC. In the event that the handshake communication protocol fails, theprogramming station 60 will not provide the SDC to the unauthorizeddevice attempting to obtain the SDC, for example an infrared reader on acounterfeit key. When the handshake communication protocol succeeds,programming station 60 permits the SDC randomly generated by the logiccontrol circuit and/or stored in the memory of the station to betransmitted by the optical transceiver to the cooperating opticaltransceiver disposed within the key 20. As will be readily apparent tothose skilled in the art, the SDC may be transmitted from theprogramming station 60 to the merchandise security key 20 alternativelyby any other suitable means, including without limitation, electricalcontacts or electromechanical, electromagnetic or magnetic conductors,as desired.

It is understood that in other embodiments, the programmable electronickey 20 may be programmed without use of a programming station 60. Forexample, the key 20 may be self-programming or could be pre-programmedwith a particular security code.

As illustrated in FIG. 2, the merchandise security key 20 programmedwith the SDC is then positioned to operatively engage the merchandisesecurity device 40. In the embodiments shown and described herein, themerchandise security device is a conventional cabinet lock that has beenmodified to be unlocked by the programmable electronic key 20.Preferably, the merchandise security device 40 is a “passive” device. Asused herein, the term passive is intended to mean that the securitydevice 40 does not have an internal power source sufficient to lockand/or unlock a mechanical lock mechanism. Significant cost savings areobtained by a retailer when the merchandise security device 40 ispassive since the expense of an internal power source is confined to themerchandise security key 20, and one such key is able to operatemultiple security devices. If desired, the merchandise security device40 may also be provided with a temporary power source (e.g., capacitoror limited-life battery) having sufficient power to activate an alarm,for example, a piezoelectric audible alarm, that is actuated by asensor, for example a contact, proximity or limit switch, in response toa security breach. The temporary power source may also be sufficient tocommunicate data, for example a SDC, from the merchandise securitydevice 40 to the merchandise security key 20 to authenticate thesecurity device and thereby authorize the key to provide power to thesecurity device.

The merchandise security device 40 further comprises a logic controlcircuit, similar to the logic control circuit disposed within the key20, adapted to perform a handshake communication protocol with the logiccontrol circuit of the key in essentially the same manner as thatbetween the programming station 60 and the key. In essence, the logiccontrol circuit of the key 20 and the logic control circuit of themerchandise security device 40 communicate with each other to determinewhether the merchandise security device is an authorized device thatdoes not have a security code, or is a device having a proper (i.e.matching) SDC. In the event the handshake communication protocol fails(e.g. the device is not authorized or the device has a non-matchingSDC), the key 20 will not program the device 40 with the SDC, andconsequently, the merchandise security device will not operate. If themerchandise security device 40 was previously programmed with adifferent SDC, the device will no longer communicate with themerchandise security key 20. In the event the handshake communicationprotocol is successful, the merchandise security key 20 permits the SDCstored in the key to be transmitted by the optical transceiver disposedwithin the key to a cooperating optical transceiver disposed within themerchandise security device 40 to program the device with the SDC. Aswill be readily apparent to those skilled in the art, the SDC may betransmitted from the merchandise security key 20 to the merchandisesecurity device 40 alternatively by any other suitable means, includingwithout limitation, via one or more electrical contacts, or viaelectromechanical, electromagnetic or magnetic conductors, as desired.Furthermore, the SDC may be transmitted by inductive transfer of datafrom the programmable electronic key 20 to the programmable merchandisesecurity device 40.

On the other hand, when the handshake communication protocol issuccessful and the merchandise security device 40 is an authorizeddevice having the same (i.e. matching) SDC, the logic control circuit ofthe key 20 causes the internal power source of the key to transferelectrical power to the device to operate the mechanical lock mechanism.In the exemplary embodiment of FIGS. 1A-9B, electrical contacts disposedon the merchandise security key 20 electrically couple with cooperatingelectrical contacts on the merchandise security device 40 to transferpower from the internal battery of the key to the merchandise securitydevice. Power may be transferred directly to the mechanical lockmechanism, or alternatively, may be transferred to a power circuitdisposed within the merchandise security device 40 that operates themechanical lock mechanism of the security device. In the embodiment ofFIGS. 1A-9B, the merchandise security device (cabinet lock) 40 isaffixed to one of the pair of adjacent and overlapping sliding doors 102of a conventional merchandise display cabinet 100 of the type suitablefor use, for example, in a retail store. The cabinet 100 may containexpensive items of merchandise 110, such as cellular (mobile)telephones, digital cameras, Global Positioning Satellite (GPS) devices,and the like. The doors 102 overlap medially between the ends of thecabinet 100 and the cabinet lock 40 is secured on an elongate lockingarm 104 of a lock bracket 105 affixed to the inner door. In theillustrated example, the key 20 transfers power to an electric motor,such as a DC stepper motor, solenoid, or the like, that unlocks the lockmechanism of the cabinet lock 40 so that the cabinet lock can be removedfrom the arm 104 of the bracket 105 and the doors moved (i.e. slid)relative to one another to access the items of merchandise 110 storedwithin the cabinet 100. As shown, the arm 104 of the bracket 105 isprovided with one-way ratchet teeth 106 and the cabinet lock 40 isprovided with complimentary ratchet pawls (not shown) in a conventionalmanner so that the key 20 is not required to lock the cabinet lock 40onto the inner door 102 of the cabinet 100. If desired, however, thecabinet lock 40 can be configured to require use of the key 20 to bothunlock and lock the cabinet lock.

It will be readily apparent to those skilled in the art that the cabinetlock illustrated herein is but one of numerous types of passivemerchandise security devices 40 that can be configured to be operated bya programmable electronic key 20 according to the present invention. Byway of example and without limitation, merchandise security device 40may be a locking base for securing a merchandise display hook to adisplay support, such as pegboard, slatwall, bar stock or wire grid, ormay be a locking end assembly for preventing the rapid removal ofmerchandise from the merchandise display hook. Alternatively, themerchandise security device 40 may be a merchandise security displaystand comprising a mechanical lock mechanism for securing the displaystand to a display support, such as a table, counter, desk, wall, orother support. Alternatively, the merchandise security device 40 may beincorporated into packaging for one or more items of merchandisecomprising a mechanical lock mechanism for separating the packaging fromthe merchandise or for removing the merchandise from the packaging.Still further, the merchandise security device 40 may be a conventionaldoor or window lock for preventing access to a room, booth, box or otherenclosure. In any of the aforementioned embodiments, the merchandisesecurity device 40 may further comprise an electronic lock mechanism,such as a conventional proximity, limit or contact switch, including anassociated monitoring circuit that activates an alarm in response to theswitch being actuated or the integrity of a sense loop monitored by themonitoring circuit being compromised. In such embodiments themerchandise security device 40 comprises a logic control circuit, or theequivalent, including a memory for storing a SDC, and a communicationsystem for initially receiving the SDC from the merchandise security key20 and subsequently communicating with the key to authenticate the SDCof the key.

As illustrated in FIG. 3A and shown enlarged in FIG. 3B, the merchandisesecurity system may also include a charging station 80 for initiallycharging and subsequently recharging a rechargeable battery disposedwithin the merchandise security key 20. The charging station 80comprises at least one, and preferably, a plurality of charging ports 82each sized and shaped to receive a key 20 to be charged or recharged. Aswill be described in greater detail with reference to FIGS. 9A and 9B,each charging port 82 comprises at least one, and preferably, aplurality of magnets 85 for securely positioning and retaining the key20 within the charging port 82 in electrical contact with the chargingstation 80. If desired, the charging station 80 may comprise an internalpower source, for example, an extended-life replaceable battery or arechargeable battery, for providing power to up to four keys 20positioned within respective charging ports 82. Alternatively, and asshown herein, charging station 80 may be operatively connected to anexternal power source by a power cord 90 having at least one conductor.

An available feature of a merchandise security system and methodaccording to the invention is that the logic control circuit of theprogrammable electronic key 20 may include a time-out function. Moreparticularly, the ability of the key 20 to transfer data and power tothe merchandise security device 40 is deactivated after a predeterminedtime period. By way of example, the logic control circuit may bedeactivated after about six to twelve hours (e.g., about eight hours)from the time the key was programmed or last refreshed by theprogramming station 60. In this manner, an authorized sales associatetypically must program or refresh the key 20 assigned to him at thebeginning of each work shift. Furthermore, the charging station 80 maybe configured to deactivate the logic control circuit of the key 20 (andthereby prevent use of the SDC) when the key is positioned within acharging port 82. In this manner, the charging station 80 can be madeavailable to an authorized sales associate in an unsecured locationwithout risk that a charged key 20 could be removed from the chargingstation and used to maliciously disarm and/or unlock a merchandisesecurity device 40. The merchandise security key 20 would then have tobe programmed or refreshed with the SDC by the programming station 60,which is typically monitored or maintained at a secure location, inorder to reactivate the logic control circuit of the key. If desired,the charging station 80 may alternatively require a matching handshakecommunication protocol with the programmable electronic key 20 in thesame manner as the merchandise security device 40 and the key.

FIG. 4 is an enlarged view showing the exemplary embodiment of themerchandise security device 40 in greater detail. As previouslymentioned, a merchandise security device 40 according to the presentinvention may be any type of security device including, but not limitedto, a security display (e.g. alarming stand), security fixture (e.g.locking hook, shelf, cabinet, etc.), security packaging (e.g.merchandise keeper for items of merchandise) or a conventionaldoor/window/drawer lock; etc., that utilizes electrical power to lockand/or unlock a mechanical lock mechanism, and optionally, furtherincludes an electronic lock mechanism, such as an alarm or a security“handshake.” At the same time, the merchandise security device 40 doesnot have an internal power source sufficient to operate the mechanicallock mechanism. As a result, the merchandise security device 40 isconfigured to receive at least power, and in one embodiment, both powerand data from an external source, such as the merchandise security key20 shown and described herein. The exemplary embodiment of themerchandise security device depicted in FIG. 4 is a cabinet lock 40configured to be securely affixed to the locking arm 104 of aconventional cabinet lock bracket 105, as previously described. Thecabinet lock 40 comprises a logic control circuit for performing asecurity handshake communication protocol with the logic control circuitof the merchandise security key 20 and for being programmed with the SDCby the key. In other embodiments, the cabinet lock 40 may be configuredto transmit the SDC to the merchandise security key 20 to authenticatethe security device and thereby authorize the key to transfer power tothe cabinet lock. As previously mentioned, the data (e.g. handshakecommunication protocol and SDC) may be transferred (i.e. transmitted andreceived) by electrical contacts, optical transmission, acoustictransmission or magnetic induction, for example.

The cabinet lock 40 comprises a housing 41 sized and shaped to contain alogic control circuit (not shown) and an internal mechanical lockmechanism (not shown). A transfer port 42 formed in the housing 41 issized and shaped to receive a transfer probe of the merchandise securitykey 20, as will be described. At least one, and sometimes, a pluralityof magnets 45 may be disposed within the transfer port 42 for securelypositioning and retaining the transfer probe of the key 20 in electricalcontact with electrical contacts of the mechanical lock mechanism, andif desired, in electrical contact with the logic control circuit of thecabinet lock 40. In the exemplary embodiment shown and described inFIGS. 1A-9B, data is transferred from the merchandise security key 20 tothe cabinet lock 40 by wireless communication, such as by infrared (IR)optical transmission, as shown and described in the commonly owned U.S.Pat. No. 7,737,843 entitled PROGRAMMABLE ALARM MODULE AND SYSTEM FORPROTECTING MERCHANDISE, the disclosure of which is incorporated hereinby reference in its entirety. Power is transferred from the merchandisesecurity key 20 to the cabinet lock 40 through electrical contactsdisposed on the transfer probe of the key and corresponding electricalcontacts disposed within the transfer port 42 of the cabinet lock. Forexample, the transfer port 42 may comprise a metallic outer ring 46 thatforms one electrical contact, while at least one of the magnets 45 formanother electrical contact to complete an electrical circuit with theelectrical contacts disposed on the transfer probe of the key 20.Regardless, electrical contacts transfer power from the key 20 to themechanical lock mechanism disposed within the housing 41. As previouslymentioned, the power transferred from the key 20 is used to operate themechanical lock mechanism, for example utilizing an electric motor, DCstepper motor, solenoid, or the like, to unlock the mechanism so thatthe cabinet lock 40 can be removed from the locking arm 104 of the lockbracket 105.

FIGS. 5-8 show an exemplary embodiment of a merchandise security key,also referred to herein as a programmable electronic key, 20 accordingto the present invention. As previously mentioned, the merchandisesecurity key 20 is configured to transfer both data and power to amerchandise security device 40 that comprises an electronic lockmechanism and a mechanical lock mechanism, as previously described.Accordingly, the programmable electronic key 20 may be an “active”device in the sense that it has an internal power source sufficient tooperate the mechanical lock mechanism of the merchandise security device40. As a result, the programmable electronic key 20 may be configured totransfer both data and power from an internal source disposed within thekey, for example a logic control circuit (i.e. data) and a battery (i.e.power). The exemplary embodiment of the programmable electronic key 20depicted in FIGS. 5-8 is a merchandise security key configured to bereceived within the transfer port 42 of the cabinet lock 40 shown inFIG. 4, as well as within the programming port 62 of the programmingstation 60 (FIG. 2; FIG. 3A) and the charging port 82 of the chargingstation 80 (FIG. 3B; FIG. 9A; FIG.9B). The programmable electronic key20 comprises a logic control circuit for performing a handshakecommunication protocol with the logic control circuit of the programmingstation 60 and for receiving the SDC from the programming station, aspreviously described. The logic control circuit of the programmableelectronic key 20 further performs a handshake communication protocolwith the logic control circuit of the merchandise security device 40 andtransfers the SDC to the device or permits operation of the device, aspreviously described. As previously mentioned, the data (e.g. handshakecommunication protocol and SDC) may be transferred (e.g. transmitted andreceived) by direct electrical contacts, optical transmission, acoustictransmission or magnetic induction.

As illustrated in FIG. 6, the programmable electronic key 20 comprises ahousing 21 and an outer sleeve 23 that is removably disposed on thehousing. The housing 21 contains the internal components of the key 20,including without limitation, the logic control circuit, memory,communication system and battery, as will be described. A window 24 maybe formed through the outer sleeve 23 for viewing indicia 24A thatuniquely identifies the key 20, or alternatively, indicates a particularitem of merchandise, a specific merchandise security device, or adisplay area within a retail store for use with the key. The outersleeve 23 is removably disposed on the housing 21 so that the indicia24A may be altered or removed and replaced with different indicia. Theprogrammable electronic key 20 may further comprise a detachable“quick-release” type key chain ring 30. An opening 26 (FIG. 8) is formedthrough the outer sleeve 23 and a key chain ring port 28 is formed inthe housing 21 for receiving the key chain ring 30. The programmableelectronic key 20 further comprises a transfer probe 25 located at anend of the housing 21 opposite the key chain ring port 28 fortransferring data and power to the merchandise security device 40, aspreviously described. The transfer probe 25 also transmits and receivesthe handshake communication protocol and the SDC from the programmingstation 60, as previously described, and receives power from thecharging station 80, as will be described in greater detail withreference to FIG. 9A and FIG. 9B.

As best shown in FIG. 8, an internal battery 31 and a logic controlcircuit or printed circuit board (PCB) 32 are disposed within thehousing 21 of the programmable electronic key 20. Battery 31 may be aconventional extended-life replaceable battery or a rechargeable batterysuitable for use with the charging station 80. The logic control circuit32 is operatively coupled and electrically connected to a switch 33 thatis actuated by the control button 22 provided on the exterior of the key20 through the outer sleeve 23. Control button 22 in conjunction withswitch 33 controls certain operations of the logic control circuit 32,and in particular, transmission of the data (i.e. handshakecommunication protocol and SDC) to the merchandise security device 40.In that regard, the logic control circuit 32 is further operativelycoupled and electrically connected to a communication system 34 fortransmitting and receiving the handshake communication protocol and SDCdata. In the exemplary embodiment shown and described herein, thecommunication system 34 is a wireless infrared (IR) transceiver foroptical transmission of data between the programmable electronic key 20and the programming station 60, as well as between the key 20 and themerchandise security device 40. As a result, the transfer probe 25 ofthe key 20 is provided with an optically transparent or translucentfilter window 35 for emitting and collecting optical transmissionsbetween the key 20 and the programming station 60, or alternatively,between the key 20 and the merchandise security device 40, as required.Transfer probe 25 further comprises at least one bi-directional powertransfer electrical contacts 36, 38 made of an electrically conductivematerial for transferring power to the merchandise security device 40and for receiving power from the charging station 80, as required.Accordingly, electrical contacts 36, 38 are electrically connected tobattery 31, and are operatively coupled and electrically connected tologic control circuit 32 in any suitable manner, for example byconductive insulated wires or plated conductors.

According to one aspect of a programmable electronic key 20 according tothe present invention, especially when used for use in conjunction witha merchandise security device 40 as described herein, the key does notrequire a physical force to be exerted by a user on the key to operatethe mechanical lock mechanism of the merchandise security device. Byextension, no physical force is exerted by the key on the mechanicallock mechanism. As a result, the key cannot be unintentionally brokenoff in the lock, as often occurs with conventional mechanical key andlock mechanisms. Furthermore, neither the key nor and the mechanicallock mechanism suffer from excessive wear as likewise often occurs withconventional mechanical key and lock mechanisms. In addition, there isno required orientation of the transfer probe 25 of the programmableelectronic key 20 relative to the charging port 82 of the chargingstation 80 or the transfer port 42 of the merchandise security device40. Accordingly, any wear of the electrical contacts on the transferprobe 25, the charging port 82 or the transfer port 42 is minimized. Asa further advantage, an authorized person is not required to positionthe transfer probe 25 of the programmable electronic key 20 in aparticular orientation relative to the transfer port 42 of themerchandise security device 40 and thereafter exert a compressive and/ortorsional force on the key to operate the mechanical lock mechanism ofthe device.

FIG. 9A and FIG. 9B show charging station 80 in greater detail. Aspreviously mentioned, the charging station 80 recharges the internalbattery 31 of the programmable electronic key 20, and if desired,deactivates the data transfer and/or power transfer capability of thekey until the key is reprogrammed with the SDC by the programmingstation 60. Regardless, the charging station 80 comprises a housing 81for containing the internal components of the charging station. Theexterior of the housing 81 has at least one, and preferably, a pluralityof charging ports 82 formed therein that are sized and shaped to receivethe transfer probe 25 of the merchandise security key 20, as previouslydescribed. At least one, and in some embodiment a plurality, of magnets85 are disposed within each charging port 82 for securely positioningand retaining the transfer probe 25 in electrical contact with thecharging station 80. More particularly, the electrical contacts 36, 38of the key 20 are retained within the charging port 82 in electricalcontact with the magnets 85 and a resilient “pogo” pin 86 made of aconductive material to complete an electrical circuit between thecharging station 80 and the battery 31 of the key.

As best shown in FIG.9B, housing 81 is sized and shaped to contain alogic control circuit, or printed circuit board (PCB) 92 that isoperatively coupled and electrically connected to the magnets 85 and thepogo pin 86 of each charging port 82. The pogo pin 86 is depressible tocomplete an electrical circuit as the magnets 85 position and retain theelectrical contacts 36, 38 within the charging port 82. In particular,magnets 85 make electrical contact with the outer ring electricalcontact 36 of the transfer probe 25 of key 20, while pogo pin 86 makeselectrical contact with inner ring electrical contact 38 of the transferprobe. When the pogo pin 86 is depressed and the electrical circuitbetween the charging station 80 and the key 20 is completed, thecharging station recharges the internal battery 31 of the key. Aspreviously mentioned, charging station 80 may comprise an internal powersource, for example, an extended-life replaceable battery or arechargeable battery, for providing power to the key(s) 20 positionedwithin the charging port(s) 82. Alternatively, and as shown herein, thelogic control circuit 92 of the charging station 80 is electricallyconnected to an external power source by a power cord 90 having at leastone conductor. Furthermore, logic control circuit 92 may be operable fordeactivating the data transfer and power transfer functions of theprogrammable electronic key 20, or alternatively, for activating the“time-out” feature of the key until it is reprogrammed or refreshed bythe programming station 60.

FIGS. 10-17B show another exemplary embodiment of a merchandise displaysecurity system and method including a programmable key, a merchandisesecurity device, a programming station and a charging station accordingto the present invention. In this embodiment, the system and methodcomprise at least a programmable electronic key (also referred to hereinas a merchandise security key) with inductive transfer, indicatedgenerally at 120, and a merchandise security device with inductivetransfer, indicated generally at 140, that is operated by the key 120.However, the programmable electronic key 120 is useable with anysecurity device or locking device with inductive transfer capabilitythat requires power transferred from the key to the device by induction,or alternatively, requires data transferred between the key and thedevice and power transferred from the key to the device by induction.Further examples include, but are not limited to, a door lock, a drawerlock or a shelf lock, as well as any device that prevents anunauthorized person from accessing, removing or detaching an item from asecure location or position.

The system and method may further comprise an optional programmingstation 60, as previously described, operable for programming the key120 with a Security Disarm Code (SDC). In addition to programmingstation 60, the system and method may further comprise an optionalcharging station with inductive transfer, indicated generally at 180,operable for initially charging and subsequently recharging an internalpower source disposed within the key 120.

As previously described with respect to programmable electronic key 20,the programmable electronic key 120 is configured to be programmed witha unique SDC by the programming station 60. Data communication betweenthe programming station 60 and the key 120 may be accomplished directly,for example by one or more electrical contacts, or indirectly, forexample by wireless communication. Any form of wireless communicationcapable of transferring data between the programming station 60 and key120 is possible, including without limitation, optical transmission,acoustic transmission, radio frequency (RF) transmission or inductivetransmission, such as magnetic induction. In the embodiments shown anddescribed herein, communication between programming station 60 and key120 is accomplished by wireless optical transmission, and moreparticularly, by infrared (IR) transceivers provided in the programmingstation and the key.

As illustrated in FIG. 11, the merchandise security system and methodfurther comprises charging station 180 for initially charging andsubsequently recharging a rechargeable battery disposed within themerchandise security key 120 via inductive transfer. The chargingstation 180 comprises at least one, and preferably, a plurality ofcharging ports 182 each sized and shaped to receive a merchandisesecurity key 120. If desired, each charging port 182 may comprisemechanical or magnetic means for properly positioning and securelyretaining the key 120 within the charging port. By way of example andwithout limitation, at least one, and sometimes a plurality of magnets(not shown), may be provided for positioning and retaining the key 120within the charging port 182 of the charging station 180. However, aswill be described further with reference to FIG. 17B, it is onlynecessary that the inductive transceiver of the merchandise security key120 is sufficiently aligned with the corresponding inductive transceiverof the charging station 180 over a generally planar surface within thecharging port 182. Thus, magnets are not required (as with chargingstation 80) to position, retain and maintain electrical contactsprovided on the merchandise security key 120 in electrical contact withcorresponding electrical contacts provided on the charging station 180.If desired, the charging station 180 may comprise an internal powersource, for example, an extended-life replaceable battery or arechargeable battery, for providing power to the key(s) 120 positionedwithin the charging port(s) 182. Alternatively, and as shown herein,charging station 180 may be operatively connected to an external powersource by a power cord 190 having at least one conductor in aconventional manner.

FIG. 12 shows the merchandise security device 140 (e.g., cabinet lock)with inductive transfer in greater detail. The embodiment of themerchandise security device depicted in FIG. 12 is a cabinet lockconfigured to be securely affixed to the locking arm 104 of aconventional cabinet lock bracket 105. As previously described, thecabinet lock 140 comprises a logic control circuit for performing ahandshake communication protocol with the logic control circuit of themerchandise security key 120 and for receiving the SDC from the key. Inother embodiments, the cabinet lock 140 may be configured to transmitthe SDC to the merchandise security key 120 to authenticate the securitydevice and thereby authorize the key to transfer power to the securitydevice. As previously mentioned, the data (e.g. handshake communicationprotocol and SDC) may be transmitted and received (e.g. transferred) byelectrical contacts, optical transmission, acoustic transmission, radiofrequency (RF) transmission or magnetic induction. In a particularembodiment, a merchandise security device 140 with inductive transferaccording to the invention may both receive electrical power from themerchandise security key 120 and communicate (i.e. transmit/receive) theSDC with the key by magnetic induction.

The cabinet lock 140 comprises a housing 141 sized and shaped to containa logic control circuit (not shown) and an internal mechanical lockmechanism (not shown). A transfer port 142 formed in the housing 141 issized and shaped to receive a transfer probe of the merchandise securitykey 120, as will be described. If desired, the transfer port 142 maycomprise mechanical or magnetic means for properly positioning andsecurely retaining the key 120 within the transfer port. By way ofexample and without limitation, at least one, and sometimes a pluralityof, magnets (not shown) may be provided for positioning and retainingthe key 120 within the transfer port 142 of the cabinet lock 140.However, as previously described with respect to the merchandisesecurity key 120 and the charging port 182 of the charging station 180,it is only necessary that the inductive transceiver of the merchandisesecurity key 120 is sufficiently aligned with the correspondinginductive transceiver of the cabinet lock 140 over a generally planarsurface within the transfer port 42. Therefore, magnets are not requiredto position, retain and/or maintain electrical contacts provided on themerchandise security key 120 in electrical contact with correspondingelectrical contacts provided on the cabinet lock 140. In the particularembodiment shown and described herein, data and/or power is transferredfrom the merchandise security key 120 to the cabinet lock 140 bywireless communication, such as infrared (IR) optical transmission asdiscussed above. Power is transferred from the merchandise security key120 to the cabinet lock 140 by induction across the transfer port 142 ofthe cabinet lock using an inductive transceiver disposed within atransfer probe of the key that is aligned with a corresponding inductivetransceiver disposed within the cabinet lock. For example, the transferprobe of the merchandise security key 120 may comprise an inductivetransceiver coil that is electrically connected to the logic controlcircuit of the key to provide electrical power from the internal batteryof the key to an inductive transceiver coil disposed within the cabinetlock 140. The inductive transceiver coil of the cabinet lock 140 thentransfers the electrical power from the internal battery of the key 120to the mechanical lock mechanism disposed within the housing 141 of thecabinet lock. As previously mentioned, the power transferred from thekey 120 is used to unlock the mechanical lock mechanism, for exampleutilizing an electric motor, DC stepper motor, solenoid, or the like, sothat the cabinet lock 140 can be removed from the arm 104 of the lockbracket 105.

FIGS. 13-16 show the programmable electronic key 120 with inductivetransfer in greater detail. As previously mentioned, the key 120 isconfigured to transfer both data and power to a merchandise securitydevice 140 that comprises an electronic lock mechanism and a mechanicallock mechanism. Accordingly, the programmable electronic key 120 may bean active device in the sense that it has an internal power sourcesufficient to operate the mechanical lock mechanism of the merchandisesecurity device 140. As a result, the programmable electronic key 120may be configured to transfer both data and power from an internalsource, such as a logic control circuit (i.e. data) and a battery (i.e.power) disposed within the key. The embodiment of the programmableelectronic key 120 depicted herein is a merchandise security key withinductive transfer capability configured to be received within thetransfer port 145 of the cabinet lock 140 shown in FIG. 12, as well asthe programming port 62 of the programming station 60 (FIG. 2) and thecharging port 182 of the charging station 180 (FIG. 11). Theprogrammable electronic key 120 comprises a logic control circuit forperforming a handshake communication protocol with the logic controlcircuit of the programming station 60 and for receiving the SDC from theprogramming station, as previously described. The logic control circuitof the programmable electronic key 120 further performs a handshakecommunication protocol with the logic control circuit of the merchandisesecurity device 140 and transfers the SDC to the merchandise securitydevice, as previously described. As previously mentioned, the data (e.g.handshake communication protocol and SDC) may be transferred (i.e.transmitted and received) by electrical contacts, optical transmission,acoustic transmission, radio frequency (RF) or magnetic induction. In aparticular embodiment, a merchandise security key 120 with inductivetransfer according to the invention may both transfer electrical powerto a merchandise security device 140 and communicate (e.g.transmit/receive) the SDC with the security device by magneticinduction.

The programmable electronic key 120 comprises a housing 121 having aninternal cavity or compartment that contains the internal components ofthe key, including without limitation the logic control circuit, memory,communication system and battery, as will be described. Although varioussizes and shapes may be employed, the housing 121 is illustrated ashaving a lower portion 123 and an upper portion 124 that are joinedtogether after assembly, for example, by ultrasonic welding. Theprogrammable electronic key 120 further defines an opening 128 at oneend for coupling the key to a key chain ring, lanyard or the like. Aspreviously mentioned, the programmable electronic key 120 furthercomprises a transfer probe 125 located at an end of the housing 121opposite the opening 128 for transferring data and power to themerchandise security device 140. The transfer probe 125 is also operableto transmit and receive the handshake communication protocol and the SDCfrom the programming station 60, as previously described, and to receivepower from the charging station 180, as will be described in greaterdetail with reference to FIG. 17A and FIG. 17B.

FIG. 14 shows an exemplary embodiment of an inductive coil 126 havinghigh magnetic permeability that is adapted (i.e. sized and shaped) to bedisposed within the housing 121 of the electronic key 120 adjacent thetransfer probe 125. As shown herein, the inductive coil 126 comprises ahighly magnetically permeable ferrite core 127 surrounded by a pluralityof inductive core windings 129. The inductive core windings 129 consistof a length of a conductive wire that is wrapped around the ferritecore. Passing an alternating current through the conductive wiregenerates, or induces, a magnetic field around the inductive core 127.The alternating current in the inductive core windings 129 may beproduced by connecting the leads 129A and 129B of the conductive wire tothe internal battery of the electronic key 120 through the logic controlcircuit. FIG. 14 further shows an inductive coil 146 having highmagnetic permeability that is adapted (i.e. sized and shaped) to bedisposed within the housing 141 of the merchandise security device (i.e.cabinet lock) 140 adjacent the transfer port 142. As shown herein, theinductive coil 146 comprises a highly magnetically permeable ferritecore 147 surrounded by a plurality of inductive core windings 149consisting of a length of a conductive wire that is wrapped around theferrite core. Placing the transfer probe 125 of the electronic key 120into the transfer port 142 of the cabinet lock 140 and passing analternating current through the inductive core windings 129 of theinductive core 126 generates a magnetic field within the transfer portof the cabinet lock in the vicinity of the inductive coil 146. As aresult, an alternating current is generated, or induced, in theconductive wire of the inductive core windings 149 of inductive coil 146having leads 149A and 149B connected to the logic control circuit of thecabinet lock 140. The alternating current induced in the inductive coil146 of the cabinet lock 140 is then transformed into a direct current,such as via a bridge rectifier on the logic control circuit, to providedirect current (DC) power to the cabinet lock. The DC power generated inthe cabinet lock 140 by the inductive coil 126 of the electronic key120, may be used, for example, to unlock a mechanical lock mechanismdisposed within the housing 141 of the cabinet lock.

As best shown in FIG. 16, an internal battery 131 and a logic controlcircuit, or printed circuit board (PCB) 132 are disposed within thehousing 121 of the programmable electronic key 120. Battery 131 may be aconventional extended-life replaceable battery, or a rechargeablebattery suitable for use with the charging station 180. The logiccontrol circuit 132 is operatively coupled and electrically connected toa switch 133 that is actuated by the control button 122 provided on theexterior of the key 120 through the housing 121. Control button 122 inconjunction with switch 133 controls certain operations of the logiccontrol circuit 132, and in particular, transmission of the data (i.e.handshake communication protocol and SDC) between the key and theprogramming station 60, as well as between the key and the merchandisesecurity device 140. In that regard, the logic control circuit 132 isfurther operatively coupled and electrically connected to acommunication system 134 for transferring the handshake communicationprotocol and SDC data. As shown and described herein, the communicationsystem 134 is a wireless infrared (IR) transceiver for opticaltransmission of data between the programmable electronic key 120 and theprogramming station 60, and between the key and the merchandise securitydevice 140. As a result, the transfer probe 125 of the key 120 isprovided with an optically transparent or translucent filter window 135for emitting and collecting optical transmissions between the key 120and the programming station 60, or between the key and the merchandisesecurity device 140, as required. Transfer probe 125 further comprisesinductive coil 126 (FIG. 14) comprising inductive core 127 and inductivecore windings 129 for transferring electrical power to the merchandisesecurity device 140 and/or receiving electrical power from the chargingstation 180 to charge the internal battery 131, as required.Accordingly, the leads 129A and 129B (FIG. 14) of the inductive coil 126are electrically connected to the logic control circuit 132, which inturn is electrically connected to the battery 131, in a suitable manner,for example by conductive insulated wires or plated conductors.Alternatively, the optical transceiver 134 may be eliminated and datatransferred between the programmable electronic key 120 and themerchandise security device 140 via magnetic induction through theinductive coil 126.

FIG. 17A and FIG. 17B show charging station 180 with inductive transfercapability in greater detail. As previously mentioned, the chargingstation 180 recharges the internal battery 131 of the merchandisesecurity key 120. In certain instances, the charging station 180 alsodeactivates the data transfer and/or power transfer capability of thekey 120 until the key has been reprogrammed with the SDC by theprogramming station 60. Regardless, the charging station 180 comprises ahousing 181 for containing the internal components of the chargingstation. The exterior of the housing 181 has at least one charging port182 formed therein that is sized and shaped to receive the transferprobe 125 of a programmable electronic key 120. As previously described,mechanical or magnetic means may be provided for properly positioningand securely retaining the transfer probe 125 within the charging port182 such that the inductive coil 126 is in alignment with acorresponding inductive coil 186 (FIG. 17B) disposed within the housing181 of the charging station 180 adjacent the charging port. As will bereadily understood and appreciated, the inductive coil 186 adjacent thecharging port 182 of the charging station 180 generates, or induces, analternating current in the conductive wire of the inductive corewindings 129 of inductive coil 126 that in turn provides DC power (forexample, via a bridge rectifier on the logic control circuit 132) tocharge the battery 131 of the programmable electronic key 120.

As best shown in FIG.17B, housing 181 is sized and shaped to contain alogic control circuit or printed circuit board (PCB) 192 that iselectrically connected and operatively coupled to an inductive coil 186adjacent each of the charging ports 182. In the manner previouslydescribed with respect to inductive coli 126 and inductive coil 146,each inductive coil 186 comprises an inductive core 187 surrounded by aplurality of inductive core windings 189 formed by a conductive wirehaving a pair of leads (not shown). When an alternating current ispassed through the conductive wire of the inductive core windings 189with the transfer probe 125 of the programmable electronic key 120disposed in the charging port 182 of the charging station 180, theinductive coil 186 generates a magnetic field that induces analternating current in the conductive wire of the inductive corewindings 129 of the inductive coil 126 of the key. The alternatingcurrent in the inductive coil 126 is then transformed into DC power tocharge the internal battery 131 of the programmable electronic key 120.As previously mentioned, charging station 180 may comprise an internalpower source, for example, an extended-life replaceable battery or arechargeable battery, for providing power to the key(s) 120 positionedwithin the charging port(s) 182. Alternatively, and as shown herein, thelogic control circuit 192 of the charging station 180 is electricallyconnected to an external power source by a power cord 190 having atleast one conductor. Furthermore, logic control circuit 192 may beoperable for deactivating the data transfer and/or power transferfunctions of the programmable electronic key 120, or alternatively, foractivating the “timing out” feature of the key until it is reprogrammedor refreshed by the programming station 60.

According to one embodiment, electronic key 20, 120 includes at leastone audio indicator for indicating the status of a lock that is operatedby the key. In this regard, lock or locking device may be associatedwith a merchandise security device, such as cabinet locks 40, 140,including a locking mechanism discussed above.

In one embodiment, FIG. 18 shows an electronic key 200 comprising alogic control circuit or electronic circuitry 210 (e.g. a controllerdisposed on a PCB) and an audio component 220 (e.g. a piezo orpiezoelectric alarm) that produces and emits an audio signal when thekey successfully unlocks or locks the cabinet lock. As discussed above,the electronic key may be configured to transmit a communicationsprotocol signal, also known as a “handshake” (e.g. a security code), tothe cabinet lock and receive a corresponding signal back from thecabinet lock authorizing the electronic key to transfer power to thelock mechanism of the lock to change the status of the lock from alocked state to an unlocked state, or alternatively, from an unlockedstate to a locked state. When the lock mechanism operates to change thestate of the lock from a locked state to an unlocked state, the locktransmits a signal to the electronic key indicating that a successfulchange of state (e.g. from locked to unlocked) has occurred.

In an embodiment illustrated in FIGS. 19 and 20, state diagrams of a“Desired Unlock” experience and a “Desired Relock” experience are shown,respectively. In this embodiment, the electronic circuitry 210 of thekey 200 activates the audio component to emit an initial audioindication, for example, a single “Beep” to indicate to a user that thestate of the lock has successfully changed from locked to unlocked.Thereafter, the audio component 220 is activated to emit a first audioindication, for example a “BeepBeep”, to indicate to a user that thelock in is an unlocked (unsecured) state. The first audio indication maybe emitted continuously or intermittently until the key 200 againtransfers power to the lock and the lock successfully operates to changethe state of the lock from the unlocked (unsecured) state back to thelocked (secured) state. Alternatively, the first audio indication may beemitted continuously or intermittently for only a predetermined periodof time (e.g., about 120 seconds) unless the state of the lock ischanged from the unlocked (unsecured) state back to the locked (secured)state within the predetermined time period.

In another embodiment illustrated in FIGS. 21 and 22, an “Impatient(undesired) Unlock” experience and an “Impatient (undesired) Relock”experience are shown, respectively. In this embodiment, the electronickey 200 includes electronic circuitry 210 and an audio component 220(e.g. a piezo or piezoelectric alarm) that produces and emits an audiosignal when the key does not successfully change the status of a lock orlocking device powered by the key. As previously described, the key 200transmits a communications protocol signal and receives a correspondingsignal back from the lock authorizing the key to transfer power to thelock mechanism of the lock to change the state of the lock. In the eventthat the lock mechanism does not successfully change the state of thelock, for example, the user removes the key 200 from the lock before theoperation of the lock mechanism is completed, the electronic circuitryof the key does not activate the audio component to emit an initialaudio indication (e.g. a “Beep”) to indicate to a user that the state ofthe lock mechanism may not have successfully changed from the locked(secured) state to the unlocked (unsecured) state. Thereafter, the audiocomponent 220 is activated to emit a second audio indication (e.g.,“BuzzBuzz”) that is different than the first audio indication toindicate to the user that the lock mechanism may not have successfullyoperated to change the state of the lock. Accordingly, the user isprompted to correct a potential problem by attempting to use the key 200once again properly to change the state of the lock. It should be notedthat the second audio indication may be emitted when the operation ofthe lock mechanism is not successfully completed or when the user doesnot maintain the key 200 in contact with the lock (or in sufficientproximity) for a sufficiently long period of time for the lock tocomplete the communications protocol with the key, regardless of whetherthe initial status of the lock is locked (secured) or unlocked(unsecured).

In a method according to one embodiment of the invention, a user alignsthe transfer port of the electronic key 200 with the transfer port of acabinet lock and activates the key to initiate the communicationsprotocol. In the event that the lock transmits an “authorized”communications protocol signal to the key 200, the key then transferspower to the lock mechanism of the lock to change the state of the lock.In a particular embodiment, the key 200 transmits a security code signalto the cabinet lock and the key receives a confirmation security codesignal back from the cabinet lock to authorize the key to transfer powerto the lock mechanism of the cabinet lock, for example, utilizing aninductive power transfer technology. In the event that the lockmechanism successfully changes the state of the cabinet lock from alocked (secured) state to an unlocked (unsecured) state, the electroniccircuitry 210 of the key 200 then activates the audio component 210 toemit an initial audio indication to indicate to the user that thecabinet lock is in an unlocked (unsecured) state (e.g. “Beep”) followedby a first audio indication (e.g. BeepBeep“) that the lock remains inthe unlocked (unsecured) state. In the event that the lock mechanismdoes not successfully change the state of the cabinet lock, for example,from the locked (secured) state to the unlocked (unsecured) state, thenthe electronic circuitry 210 of the key 200 activates the audiocomponent 220 to emit a second audio indication (e.g., “BuzzBuzz”) thatis different than the first audio indication to indicate to the userthat the operation of the lock mechanism was unsuccessful and that thestatus of the cabinet lock has not changed, or alternatively, that thecommunications protocol between the key and the lock was not completed.

It should be noted that a cabinet lock key 200 with audio indicatorsaccording to embodiments of the invention may be used with more than onecabinet lock. In the event that the cabinet lock key 200 is used with aplurality of cabinet locks, each successful change of a lock from alocked (secured) state to an unlocked (unsecured) state activates theaudio component 220 of the key to emit the first audio indication for apredetermined period of time, for example, about 2 minutes. The memoryof the electronic circuitry 210 of the key 200 may store eachpredetermined period of time in a time bank and increments the time bankan additional predetermined time period (e.g. about 2 minutes) each timethe state of another cabinet lock is changed from the locked (secured)to the unlocked (unsecured) state, while simultaneously counting downfrom the accumulated time bank. Each time the state of a cabinet lock ischanged back from the unlocked (unsecured) state to the locked (secured)state, the memory of the electronic circuitry 210 of the key 200 willsubtract one increment of the predetermined period of time (e.g. about 2minutes) from the time bank. In this manner, more than one cabinet lockcan be unlocked before the first cabinet lock is relocked without thefirst audio indication terminating. The electronic circuitry 210 of thekey 200 will continue to activate the audio component 220 to emit thefirst audio indication as long as at least one cabinet lock remains inthe unlocked (unsecured) state and the memory of the electroniccircuitry of the key continues to contain and count down any portion ofa predetermined time period. In one embodiment, this feature of acabinet lock key 200 with audio indicators according to the invention isreferred to as “stacking” the time period of the first audio indicator.It will be readily apparent to one of ordinary skill in the art that thesame feature may be provided for the second audio indicator in the eventthat the state of more than one cabinet lock is not successfully changedbefore the operation of the lock mechanism of the first cabinet lock iscorrected.

In another embodiment, a first audio indicator may be emitted when astate of a first lock has been successfully changed to unlocked, and asecond audio indicator different than the first may be emitted if theuser attempts to unlock a second lock prior to locking the first lock.Thus, the electronic key 200 may be configured to only lock or unlockone lock at a time.

It is understood that the audio component 220 may be configured to emitany type of audible signal. In addition, the audio component 220 may beconfigured to emit one or more audible signals to differentiate betweendifferent status changes. For example, a successful change in state ofthe lock may be indicated by a first audio indicator, while anunsuccessful change in state may be indicated by a second, differentaudio indicator. Moreover, the audio component 220 may be used inconjunction with other components of the merchandise display securitysystem. For example, the audio component 220 may be configured to emitan audio indicator when the electronic key has been fully charged in thecharging station 180, or an audio indicator may be emitted when theelectronic key has been programmed at the programming station 60. Stillfurther, it is understood that the programming station 60 may be omittedin some embodiments where the electronic key 220 is programmed directlyinto the electronic key or where the electronic key is preprogrammed.

The foregoing has described one or more embodiments of a merchandisedisplay security system for displaying and protecting an article ofmerchandise. Embodiments of a merchandise display security system havebeen shown and described herein for purposes of illustrating andenabling the best mode of the invention. Those of ordinary skill in theart, however, will readily understand and appreciate that numerousvariations and modifications of the invention may be made withoutdeparting from the spirit and scope of the invention. Accordingly, allsuch variations and modifications are intended to be encompassed by theappended claims.

That which is claimed is:
 1. A security system for protecting an item ofmerchandise from theft, comprising: an electronic key; and a pluralityof merchandise security devices each comprising a lock mechanism that isconfigured to be locked or unlocked in response to receiving electricalpower transferred from the electronic key to the lock mechanism, whereinthe electronic key is incapable of unlocking a second lock mechanismprior to locking a first lock mechanism that has been successfullyunlocked.
 2. The security system according to claim 1, wherein theelectrical power is configured to transferred from the electronic keyvia inductive transfer.
 3. The security system according to claim 1,wherein the electronic key comprises an audio component.
 4. The securitysystem according to claim 3, wherein the audio component is configuredto emit an audible signal using a piezo.
 5. The security systemaccording to claim 3, wherein the audio component is configured to emita first audible signal indicative of successfully changing a state ofthe first lock mechanism and a second audible signal that is differentthan the first audible signal and that is indicative of unsuccessfullychanging a state of the second lock mechanism.
 6. The security systemaccording to claim 3, wherein the audio component is configured to emitan audible signal in response to the lock mechanism being locked orunlocked.
 7. The security system according to claim 3, wherein the audiocomponent is configured to indicate a status of the lock mechanism basedon the change in state thereof.
 8. The security system according toclaim 7, wherein the audio component is configured to emit a firstaudible signal indicative of successfully changing a state of the lockmechanism and a second audible signal that is different than the firstaudible signal and that is indicative of unsuccessfully changing a stateof the lock mechanism.
 9. The security system according to claim 7,wherein the audio component is configured to continuously orintermittently emit an audible signal while the lock mechanism is in anunlocked state.
 10. The security system according to claim 7, whereinthe audio component is configured to emit: (i) an initial audioindication in response to the lock mechanism being unlocked, (ii) afirst audio indication while the lock mechanism is in an unlocked state,and (iii) a second audio indication in response to unsuccessfullychanging the state of the lock mechanism, and wherein each of theinitial, first, and second audio indications are different than oneanother.
 11. The security system according to claim 1, wherein theelectronic key comprises electronic circuitry configured to communicatea communications protocol signal between the electronic key and thelock.
 12. The security system according to claim 11, wherein thecommunications protocol signal comprises a security code.
 13. Thesecurity system according to claim 1, wherein the electronic key isconfigured to receive a signal transmitted from the lock mechanismindicating a change in state thereof.
 14. A method for protecting anitem of merchandise susceptible to theft, comprising: transferringelectrical power from an electronic key to a first lock to thereby lockor unlock the first lock, wherein the electronic key is incapable ofunlocking a second lock prior to locking the first lock that has beensuccessfully unlocked.
 15. The method according to claim 14, furthercomprising emitting an audible signal with the electronic key inresponse to a change in state of the first lock.
 16. The methodaccording to claim 15, wherein emitting comprises emitting a firstaudible signal indicative of successfully changing a state of the firstlock and emitting a second audible signal that is different than thefirst audible signal and that is indicative of unsuccessfully changing astate of the second lock.
 17. The method according to claim 15, whereinemitting comprises continuously or intermittently emitting an audiblesignal while the first lock is in an unlocked state.
 18. The methodaccording to claim 14, further comprising communicating a communicationsprotocol signal between the electronic key and the first lock.
 19. Themethod according to claim 14, wherein transferring comprises inductivelytransferring electrical power.
 20. The method according to claim 14,further comprising receiving a signal at the electronic key transmittedfrom the first lock indicating a change in state thereof.